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If its a ROM then there's nothing you can do
ROMs aren't legit so they'll be glitching.
HGSS have some kind of anti emulation patch
(I think )
So HGSS ROMS hate everone who tries to emulate it.
If it's not a ROM either once you've tried to cheat on it and because you've messed up the coding it might be dodgy. Or your game cartridges just ...worn out